Dual-mode superconductive filter having an opening pattern in a ground plane

Abstract

A superconductive device that includes a ground film made of the superconductive material, wherein part of the ground film has an opening pattern.

1. A superconductive device comprising:
 a dielectric substrate; 
 a resonator pattern disposed on a first surface of the dielectric substrate, the resonator pattern having a disk shape, the resonator pattern comprising a superconductive material; 
 an input signal line and an output signal line, each of the signal lines being disposed adjacent to the resonator pattern; and 
 a ground film disposed on a second surface of the dielectric substrate, the ground film comprising the superconductive material, 
 wherein the ground film includes an opening pattern, the opening pattern being provided in a region corresponding to a region between a first imaginary line extending from the input signal line over the resonator pattern and a second imaginary line extending from the output signal line over the resonator pattern. 
 
   
   
     2. The superconductive device according to  claim 1 , wherein the opening pattern includes a circular arc. 
   
   
     3. The superconductive device according to  claim 2 ,
 wherein the curvature radius of the circular arc is smaller than or equal to one-fourth a wavelength λ of an input signal. 
 
   
   
     4. The superconductive device according to  claim 1 ,
 wherein the dielectric substrate has a relative dielectric constant of 8 to 10 when a signal having a frequency of 3 to 5 GHz is applied. 
 
   
   
     5. The superconductive device according to  claim 1 ,
 wherein the superconductive device has two resonant modes perpendicular to each other in the 3 to 6 GHz band. 
 
   
   
     6. The superconductive device according to  claim 1 ,
 wherein part of the opening pattern overlaps with a region where the resonator pattern is located. 
 
   
   
     7. The superconductive device according to  claim 1 ,
 wherein the opening pattern is provided at a position corresponding to a periphery of the resonator pattern. 
 
   
   
     8. The superconductive device according to  claim 1 :
 wherein the opening pattern is provided at a position corresponding to a position close to a center of a region between the first imaginary line and the second imaginary line. 
 
   
   
     9. The superconductive device according to  claim 1 ,
 wherein the superconductive material comprises an oxide superconductive material. 
 
   
   
     10. The superconductive device according to  claim 1 ,
 wherein the opening pattern is a circular opening pattern. 
 
   
   
     11. The superconductive device according to  claim 1 ,
 wherein the opening pattern is a U-shaped opening pattern. 
 
   
   
     12. The superconductive device according to  claim 1 ,
 wherein the opening pattern is a rectangular opening pattern, with corners which are curved and rounded. 
 
   
   
     13. A superconductive device comprising:
 a dielectric substrate; 
 a resonator pattern disposed on a first surface of the dielectric substrate a resonator pattern comprising a superconductive material; and 
 a ground film disposed on a second surface of the dielectric substrate, the ground film comprising the superconductive material, 
 wherein the ground film includes an opening pattern, the opening pattern being a U-shaped opening pattern. 
 
   
   
     14. A superconductive device comprising:
 a dielectric substrate; 
 a resonator pattern disposed on a first surface of the dielectric substrate a resonator pattern comprising a superconductive material; and 
 a ground film disposed on a second surface of the dielectric substrate, the ground film comprising the superconductive material, 
 wherein the ground film includes an opening pattern that includes a circular arc, the curvature radius of the circular arc being smaller than or equal to one-fourth of a wavelength λ of an input signal.